I used one on a Searay 21.5 Express Cruiser. Big, heavy, deep boat. It made planing much quicker and seemed to help keep on plane when cornering. I'd recommend it for that use. I had the model with the built in trolling plate that swung down. It used a brass pin that would break and release the plate if you forgot to raise it after fishing. This feature was crap. The pin would break even at trolling speed. A constant headache.